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8118995 |
Process for inhibiting fouling in hydrocarbon processing
A method for inhibiting the formation of fouling materials including contacting hydrocarbon media containing aldehyde compounds with an antifoulant while treating the hydrocarbon media with a basic...
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7767170 |
Cracking hydrocarbon feedstock containing resid utilizing partial condensation of vapor phase from vapor/liquid separation to mitigate fouling in a flash/separation vessel
A process is provided for cracking hydrocarbon feedstock containing resid comprising: heating the feedstock, mixing the heated feedstock with a fluid and/or a primary dilution steam stream to form...
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7560590 |
Rectificative separation of an acrylic acid-containing liquid
A process for rectificatively separating an acrylic acid-containing liquid, by withdrawing an acrylic acid-rich stream from the rectification column above the feed point and...
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7396519 |
Preparation of a high purity and high concentration hydroxylamine free base
A high purity aqueous solution of hydroxylamine product is prepared by treating an aqueous solution of hydroxylammonium salt with a base like ammonia at low temperatures. A novel process can be...
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7205438 |
Solvent recovery blends from diene production
A diene production stream comprising a solvent recovery blend from diene production comprising one or more fouling agent, one or more extractive distillation solvent, and from about 1 ppm to about...
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7182839 |
Preventing deposition of fouling agents onto equipment
Methods and compositions effective to prevent deposition of fouling agents, preferably polymerization precursors, on handling equipment, particularly during solvent recovery.
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7169268 |
Color stabilization of amines
The present invention concerns a process for providing tertiary amine products which are color-stable, and have a greatly reduced tendency to take on color during their storage. According to the...
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7074304 |
Process for purifying alicyclic alcohols
A process for purifying alicyclic alcohols by distillation, wherein the alicyclic alcohols are distilled in the presence of from 1 to 550 ppm of acidic compounds.
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7037412 |
Method for preparing deodorized N-vinyl-2-pyrrolidone
The invention provides a method for producing purified N-vinyl-2-pyrrolidone free of odorous components. The method is composed of distilling with a distillation column a liquid, which is formed by...
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6964728 |
Separation process
Bisphenol-A-bis(neopentylglycolphosphate) products of enhanced properties and processes for preparing them are described. One of the processes includes (a) mixing and reacting neopentyl glycol and...
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6793776 |
Operation of heads column
A process for the enhanced recovery and operation of hydrogen cyanide (HCN)/heads column obtained from the reactor effluent of an ammoxidation reaction of propane, propylene or isobutylene by...
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6596129 |
Distillation process for easily polymerizable substance-containing solution
The present invention provides: a process can be preventive of a polymerization in a distillation apparatus when distilling a solution containing easily polymerizable substances such as...
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6475347 |
High boiling inhibitors for distillable, polymerizable monomers
Disclosed herein are compounds of the structure whereinR1, R2, and R3 are organic radicals of C1 to C20, such that the combination of the three contain at least twelve carbon atoms and R3 is bound...
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6475348 |
Mixture of substances containing compounds with vinyl groups and stabilizers
A mixture contains one or more vinyl-containing compounds as component (A) and, as a further component, a stabilizer (B) which contains one or more readily volatile nitroxyl compounds as component...
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6391161 |
Method for reducing the chlorine content of low molecular weight isocyanates
An organic isocyanate or mixture of isocyanates is treated with at least one high molecular weight ester of phosphoric acid corresponding to a specified formula to remove chlorine compounds. The...
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6358372 |
Method of reducing formation of precipitates in solvent recovery system
A method of removing at least one inert reaction diluent and/or wash solvent from a waste stream from a catalyst precursor production unit is disclosed, where the waste stream includes at least one...
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6352618 |
Modular solvent recovery device
A process is disclosed for manufacturing a concentrated residue from a photopolymer fluid which includes photopolymer and photopolymer solvent. The photopolymer fluid may be derived by chemically...
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6350352 |
Process for separating by distillation pure (meth)acrylic acid from mixtures
A process for distillative separation of pure (meth)acrylic acid from mixtures which include comprise (meth)acrylic acid and dimers and oligomers of (meth)acrylic acid and are essentially free from...
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6299734 |
Preparation of an aqueous solution of free hydroxylamine
An aqueous solution of free hydroxylamine is prepared by treating a hydroxylammonium salt with ammonia by the countercurrent method in a stripping column by a process in which hydroxylamine is...
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6254734 |
Barometric evaporation process and evaporator
A process for the evaporation of an available warm or hot liquid under a vacuum by applying a pressure drop thereon initiating flash-down evaporation, and followed by further flash-down evaporation...
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6235161 |
Inhibition of 141b decomposition
Inhibition of the formation of unsaturated carbon compounds during the heating of 141b involving the addition of various inhibitors such as butylene oxide and/or the use of a vessel made of a...
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6159345 |
Method and apparatus for recovering and/or recycling solvents
A method and apparatus for recycling and recovering potentially explosive solvents includes providing a contaminated solvent to a distillation tank, vaporizing the solvent in the distillation tank,...
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6123812 |
Process for distilling ethylene oxide
A process for distilling ethylene oxide out of a mixture including ethylene oxide in a column at an absolute pressure of from 2 to 10 bar and a temperature of 20 to 180° C. by withdrawing pure ...
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6090240 |
Method of inhibiting scaling in black liquor evaporators
A method of inhibiting calcium carbonate scaling in a multi-stage evaporation plant of black liquor by heat-treating calcium-containing liquor includes a first stage wherein the calcium-containing...
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6074532 |
Adjunct for removal of aldehydes from chemical manufacturing production streams during distillative purification
A method for improving purification efficiency when distilling off aldehyde contaminants during chemical manufacturing processes by adding a substituted aromatic amine having electron donating...
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6024839 |
Hydroquinone to inhibit fouling of epichlorohydrin equipment
A method of inhibiting fouling of one or more pieces of equipment for processing crude epichlorohydrin by treating at least one epichlorohydrin stream entering or exiting the one or more pieces of...
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5993607 |
Process for the purification of chlorinated aromatic hydrocarbons
In a process for the purification by distillation of chlorinated aromatic hydrocarbons originating from the chlorination of aromatic hydrocarbons in the presence of FeCl3, the crude reaction...
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5968322 |
Process for preparing refined acrylic esters
A process for preparing refined acrylic esters, the process including steps of distilling an acrylic ester containing stream in the presence of hydroquinone or substituted hydroquinone, at a...
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5879534 |
Non-enolizable oxygenates as anti foulants in ethylene dichloride manufacture
A method of inhibiting the formation of fouling deposits occurring in spent caustic wash systems used for ethylene dichloride (EDC) manufacturing processes. Fouling occurs in these systems when...
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5837107 |
Process for production of aqueous solutions of free hydroxylamine
An aqueous solution of free hydroxylamine is prepared by a process in which the solution obtained by treating a hydroxylammonium salt with a base is separated into an aqueous hydroxylamine solution...
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5693190 |
Recovery of glycols from used antifreeze compositions by distillation
A method for the recovery of glycols from used antifreeze compositions by distillation entails the used antifreeze composition being treated before and/or during its distillation with an effective...
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5683554 |
F141b crude stabilization
Separation of 1,1-dichloro-1-fluoroethane (141b) from lower boiling components contained in a crude 141b feed stream mixture by adding the feed stream mixture, and, based upon the weight of 141b in...
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5660690 |
Method for distilling hexamethylcyclotrisiloxane
The invention relates to an improved distillation method wherein hexamethylcyclotrisiloxane is isolated from a crude blend thereof by mixing the crude blend with a hydrocarbon co-solvent having a...
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5659095 |
Composition for inhibiting the polymerization of aromatic vinyl monomers
A polymerization inhibitor composition for inhibiting the polymerization of aromatic vinyl monomers at elevated temperatures comprising:(a) a benzofuroxan derivative of the formula ##STR1## wherein...
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5632865 |
Method for introduction of aggressive liquid additives
The invention is a method of introducing an aggressive liquid additive into a vapor-containing process stream including (a) heating the liquid additive by a heating means thereby producing a heated...
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5578173 |
Removal of dimethylterephthalate from a methanolysis vapor stream
A method of removing dimethyl terephthalate (DMT) from a vapor stream. The vapor stream includes dimethyl terephthalate (DMT), methylhydroxyethyl terephthalate (MHET), glycols and methanol. A...
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5545743 |
Process for heat-fractionation of organosilanes
An improved process for the heat-fractionation of a mixture comprising an organosilane and a borane or borane forming compound. The improvement comprises the presence of a tertiary organoamine or...
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5419815 |
Process for purifying fatty acid amides
The present invention relates to a process for purifying fatty acid amides, which contains the following process steps: neutralization of the fatty acid by addition of an aqueous alkaline solution...
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5378783 |
Dicyclopentadiene activation method and polymerization composition
A highly polymerizable dicyclopentadiene (DCPD) monomer composition is obtained. The dicyclopentadiene so obtained is highly suitable for ring-opening polymerization by metathesis catalysts. The...
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5370774 |
Process for isolating pure diketene with recovery of materials of value
The invention relates to a process for isolating pure diketene with recovery of materials of value by continuous, two-stage distillation of crude diketene at reduced pressure and with continuous...
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5342487 |
Distillation process
A process for reducing the amount of unwanted di(meth)acrylate produced during the distillation of hydroxyalkyl acrylates or hydroxyalkyl methacrylates.
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5324393 |
Fouling prevention in ethylene dichloride distillation units
A method for preventing fouling of ethylene dichloride distillation units which comprises treating the feed to such unit with a fouling preventing amount of a composition comprising (a) 2-15 weight...
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5306850 |
Purification process for a hydrofluoroalkane
Process for purifying a hydrofluoroalkane with respect to impurities which are less volatile than the hydrofluorocarbon, by distillation in the presence of an acid-scavenger, for example a C3 -C8...
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5300198 |
Process for the separation of ethylidene diacetate from acetic anhydride
A distillation process for the separation of acetic anhydride from a mixture thereof with ethylidene diacetate wherein the mixture of acetic anhydride and ethylidene diacetate is fed to the mid...
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5242549 |
Distillation separation process of titanium tetrachloride and halohydrocarbon
An improved process for separation of valuable components of a waste stream resulting from production of an olefin polymerization procatalyst by the addition to the waste stream of a separation...
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5240469 |
Antifoulant composition comprising an acrylate ester containing C4 -C22 alcohol esters and amino alcohol esters and phenylene diamine
A method for preventing fouling of ethylene dichloride distillation units which comprises treating the feed to such units with a fouling preventing amount of a composition comprising: TBL...
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5131984 |
High quality phenol rectification with energy recovery
The process for rectification of phenol prepared from crude phenol being the product of decomposition of cumene hydroperoxide and having previously been distilled to remove large portions of...
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5110997 |
Process for preventing fouling in the production of ethylene dichloride
A method of inhibiting fouling in a crude ethylene dichloride stream comprises introducing into the stream an inhibiting amount of an antifoulant selected from (A) an acylated amine (e.g., reaction...
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5108551 |
Reclamation of alkanolamine solutions
The present invention provides a method for purifying alkanolamine solutions which have lost at least a portion of their acid gas sorption capacity due to degradation of the alkanolamine into heat...
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5104493 |
Tertiary butyl hydroperoxide concentration
The invention relates to a process for concentrating TBHP while avoiding flammability and explosion hazards by distilling a mixture of TBHP and TBA under reduced pressure of up to 300 mm Hg and...
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